Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Timing of expense recognition	$ 28,710	$ 24,470
Net operating losses	15,824	19,968
Goodwill	11,698	19,315
Other, net	13,125	10,155
Deferred tax assets	69,357	73,908
Deferred tax liabilities:
Intangible assets, due primarily to purchase accounting	(16,453)	(15,212)
Fixed assets	(70,128)	(76,567)
Construction contract accounting	(9,196)	(9,769)
Joint ventures	(26,764)	(41,669)
Other	(15,672)	(11,962)
Deferred tax liabilities	(138,213)	(155,179)
Net deferred tax liabilities	(68,856)	(81,271)
Net Deferred Tax Liabilities
Deferred tax assets	2,133	1,695
Deferred tax liabilities	(70,989)	(82,966)
Net deferred tax liabilities	$ (68,856)	$ (81,271)